RT Journal Article SR Electronic T1 The challenge of early diagnosis of psoriatic arthritis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 3 OP 5 VO 35 IS 1 A1 Ignazio Olivieri A1 Salvatore D'Angelo A1 Angela Padula A1 Carlo Palazzi YR 2008 UL http://www.jrheum.org/content/35/1/3.abstract AB